Creature from the Black Lagoon (1954)

Continuity mistake: When Richard Denning and Richard Carlson approach the boat ladder coming back from their first dive in the Black Lagoon, you can see the net hanging underwater just to their right. It already has the huge torn hole that is in it when they hoist it up after the creature is caught for a moment in a later scene.

Continuity mistake: When the scientists find the creature climbing onto the ship at one point, it's night time. It smashes a lamp, then jumps back in the water, swims across the lagoon, then standing up near the water's edge, it grunts and slashes at the spotlight they aim at it, then goes back underwater. Two of the scientists dive in to go after it, and follow it through an underwater (then above-water) cave. When both creature and scientists exit the cave, however, it is not only daytime, but the other scientists are waiting on the shore nearby.

redbaron2000

Plot hole: The creature gets caught in the fishing net and (after a struggle that shook the whole boat) freed itself. The scientists, upon drawing up the net, find one of the creature's claws, and thus they now seek its source. Shortly after, while Mark is busy loading a harpoon gun, Dave is protesting, stating, "This...this thing *alive* and in it's natural habitat..." It would seem that at this point, they know the creature is *not* dead, but very much alive. They dive, they see it, Mark shoots it with a harpoon, and then upon surfacing, they argue a bit before reporting what they saw to everyone else. So why after seeing it underwater, fully knowing that "this thing (is) alive," do they act so surprised to see it, as if they didn't have a clue it could possibly still exist?

redbaron2000

Trivia: William Alland who produced The Creature From The Black Lagoon, acted in Citizen Kane as the reporter who investigates Kane's career. During the filming Alland met Mexican cinematographer Gabriel Figueroa Mateos, who told him a legend of an amphibious creature who comes out of the River Amazon to seize women. Alland wrote a story based on the legend, which would form the basis of this 1954 horror film.

Rob Halliday

Lucas: It is impossible. But I, Lucas, will do it.

Dr. Thompson: Demon, eh? Well, it's no more far-fetched than your gillman.
Lucas: There are many strange legends in the Amazon. Even I, Lucas, have heard the legend of a man-fish.

Lucas: What kind of fishing is that? Who eats rocks?
Carl Maia: I eat rocks, in a manner of speaking. I crush and look inside them and they tell me things.
Lucas: What do they tell you?
Carl Maia: How old they are.